\(\dfrac{x-1}{5}=\dfrac{y-2}{3}=\dfrac{z-2}{2}=\dfrac{2y-4}{6}=\dfrac{x-1+2y-4-z+2}{5+6-2}=\dfrac{6-5}{9}=\dfrac{1}{9}\)

\(\Rightarrow\left\{{}\begin{matrix}9x-9=5\\9y-18=3\\9z-18=2\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}x=\dfrac{14}{9}\\y=\dfrac{7}{3}\\z=\dfrac{20}{9}\end{matrix}\right.\)

mình đang cần gấp m.n giúp mình nha :33

chia hết cho mấy vậy bạn?

Chọn B

\(\left(y-\dfrac{2}{3}\right):\dfrac{4}{5}=\dfrac{5}{6}\)

\(y-\dfrac{2}{3}=\dfrac{5}{6}\times\dfrac{4}{5}\)

\(y-\dfrac{2}{3}=\dfrac{2}{3}\)

\(y=\dfrac{2}{3}+\dfrac{2}{3}\)

\(y=\dfrac{4}{3}\)

\(y-\dfrac{2}{3}=\dfrac{5}{6}\times\dfrac{4}{5}\)

\(y-\dfrac{2}{3}=\dfrac{2}{3}\)

\(y=\dfrac{2}{3}+\dfrac{2}{3}\)

\(y=\dfrac{4}{3}\)

y – 2/3 = 5/6 x 4/5

y – 2/3 = 2/3

y= 2/3 + 2/3

y = 4/3

0,5x-\(\dfrac{2}{3}.\left(x-2\right)=\dfrac{1}{6}\) 

\(\dfrac{1}{2}x-\dfrac{2}{3}x-\dfrac{4}{3}=\dfrac{1}{6}\) 

   \(x.\left(\dfrac{1}{2}+\dfrac{2}{3}\right)=\dfrac{1}{6}+\dfrac{4}{3}\) 

                \(x.\dfrac{7}{6}=\dfrac{3}{2}\) 

                    \(x=\dfrac{3}{2}:\dfrac{7}{6}\) 

                    \(x=\dfrac{9}{7}\)

`0,5x-2/3 .(x-2)=1/6`

`0,5x - 2/3 x + 4/3= 1/6`

` -1/6x = -7/6`

`x=7`

\(0,5x-\dfrac{2}{3}.\left(x-2\right)=\dfrac{1}{6}\) 

     \(\dfrac{1}{2}x-\dfrac{2}{3}x-\dfrac{4}{3}=\dfrac{1}{6}\) 

        \(x.\left(\dfrac{1}{2}-\dfrac{2}{3}\right)=\dfrac{1}{6}+\dfrac{4}{3}\) 

        \(x.\dfrac{-1}{6}=\dfrac{3}{2}\) 

                \(x=\dfrac{3}{2}:\dfrac{-1}{6}\) 

                \(x=-9\)

\(x\times\dfrac{3}{5}=\dfrac{2}{3}+\dfrac{1}{6}=\dfrac{5}{6}\)

\(x=\dfrac{5}{6}:\dfrac{3}{5}=\dfrac{25}{18}\)

X x 3/5 = 5/6
X          = 5/6 : 3/5
X          = 25/18

\(x\times\dfrac{3}{5}=\dfrac{2}{3}+\dfrac{1}{6}\)

\(x\times\dfrac{3}{5}=\dfrac{4}{6}+\dfrac{1}{6}\)

\(x\times\dfrac{3}{5}=\dfrac{5}{6}\)

\(x=\dfrac{5}{6}:\dfrac{3}{5}\)

\(x=\dfrac{5}{6}\times\dfrac{5}{3}\)

\(x=\dfrac{25}{18}\)

\(=x^2+x+6x+6\\ =x\left(x+1\right)+6\left(x+1\right)\\ =\left(x+6\right)\left(x+1\right)\)

\(c,x^2+7x+6=x^2+x+6x+6=\left(x^2+x\right)+\left(6x+6\right)=x.\left(x+1\right)+6.\left(x+1\right)=\left(x+1\right).\left(x+6\right)\)

`=> x ^2 + x + 6 x + 6`

`=>x ( x + 1 ) + 6 ( x + 1 )`

`=> ( x + 6 ) ( x + 1 )`

a) 11 - 3(2x - 1) = -8x + 5

⇔ 11 - 6x + 3 = -8x + 5

⇔ -6x + 8x = 5 - 11 - 3

⇔ 2x = -9

⇔ x = -9/2

Vậy S = {-9/2}

b) (x - 3)/5 + (1 + 2x)/3 = 6

⇔ 3(x - 3) + 5(1 + 2x) = 6.15

⇔ 3x - 9 + 5 + 10x = 90

⇔ 13x = 90 + 9 - 5

⇔ 13x = 94

⇔ x = 94/13

Vậy S = {94/13}

\(\Rightarrow\dfrac{2x}{6}=\dfrac{3y}{6}=\dfrac{z}{6}\Rightarrow\dfrac{x}{3}=\dfrac{y}{2}=\dfrac{z}{6}=\dfrac{x+y+z}{3+2+6}=\dfrac{11}{11}=1\\ \Rightarrow\left\{{}\begin{matrix}x=3\\y=2\\z=6\end{matrix}\right.\Rightarrow z-x=6-3=3\left(A\right)\)

giúp mik với

đi mà

mình thấy hơi sai sai